Liquid crystal display device

ABSTRACT

Disclosed is a liquid crystal display device of which overall size and weight can be minimized. The liquid crystal display device has a light generating unit for generating a light. A light guiding plate guides the light to a display unit for displaying an image. A reflection plate is disposed under the light guiding plate for reflecting the light to the light guiding plate. A receiving container receives the reflection plate, the light guiding plate and the light generating unit. At least one boss is formed on a bottom of the receiving container for preventing the light generating unit from being moved by guiding a position of the light generating unit. Accordingly, the number of the parts installed in the liquid crystal display device can be reduced, and the manufacturing cost can be decreased because the manufacturing process is simplified in comparison with the liquid crystal display device including a separate lamp cover.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. application Ser.No. 10/994,733 filed Nov. 22, 2004 now U.S. Pat. No. 7,372,515, which isa divisional application of U.S. application Ser. No. 10/074,508, filedon Feb. 12, 2002 and issued as U.S. Pat. No. 6,847,416, which claimspriority to and the benefit of Korean Patent Application No. 2001-52358filed on Aug. 29, 2001, all of which are incorporated by referenceherein in their entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a liquid crystal display device, andmore particularly to a liquid crystal display device having a small sizefor portable mobile communication devices or game devices.

2. Description of the Related Art

Information processing devices have been rapidly developed in a trendwith various architectures, functions and faster information processingspeed. Information processed in these information processing devices hasan electrical signal format. In order to visually confirm informationprocessed in the information processing device, a display device as aninterface is necessary.

A liquid crystal display device, which is lighter and smaller than a CRTtype display device, has been developed. The liquid crystal displaydevice enables a full color display with a high resolution. As a result,the liquid crystal display device is widely used for a monitor of acomputer, a television receiver, and another display device.

When a voltage is applied to a liquid crystal cell, a moleculararrangement of the liquid crystal is changed to cause a change inoptical properties. As a result, visual properties are changed todisplay various images.

Liquid crystal display devices are divided into to a TN (TwistedNematic) type and an STN (Super-Twisted Nematic) type. The liquidcrystal devices are also divided according to the driving type into anactive matrix display type that uses a switching device, and a TN liquidcrystal and a passive matrix display type using an STN liquid crystal.

The active matrix display type is used in a TFT-LCD and drives an LCD byusing a TFT as a switching device. The passive matrix display type doesnot use any transistor and does not need a complex circuit.

Further, liquid crystal display devices are divided into a transmissiveliquid crystal display device using a backlight and a reflective liquidcrystal display device that uses an exterior light source according to amethod for using a light source.

The transmissive liquid crystal display device which uses the back lightas a light source has a heavy weight and a large volume by the existenceof the back light, but is widely used since it independently displays animage without using an exterior light source.

In particular, a liquid crystal display device having a properly reducedsize for portability is demanded according to the rapid development ofthe communication devices. Thus, a display device is desired which haslight weight, thin thickness and small size as well as high displayquality to be applied to the mobile communication devices and to thegame devices considering portability thereof.

SUMMARY OF THE INVENTION

The present invention solves the aforementioned problems by providing aliquid crystal display device of which a total weight can be minimized.

Also, the invention provides a liquid crystal display device of which anoverall size can be reduced.

Further, the invention provides a liquid crystal display device which iseasily assembled with an external apparatus such as an informationprocessing device.

The invention further provides a liquid crystal display device capableof minimizing loss of a light.

In one aspect of the invention, there is provided a liquid crystaldisplay device having a light generating unit for generating a light, alight guiding plate for guiding the light toward a display unit fordisplaying an image, a reflecting plate disposed under the light guidingplate for reflecting the light to the light guiding plate, and areceiving container for receiving the reflecting plate, the lightguiding plate and the light generating unit. At least one boss is formedon a bottom of the receiving container for preventing the lightgenerating unit from being moved by guiding a position of the lightgenerating unit.

The receiving container includes a first receiving container having aside wall and a bottom where an opening is formed at a predeterminedportion of the bottom for exposing a rear surface of the reflectingplate, and a second receiving container for preventing the reflectingplate, the light guiding plate and the light generating unit from beingseparated from the first receiving container. The second receivingcontainer is combined with the first receiving container. Four bossesmay be respectively formed at corner portions of the bottom of the firstreceiving container and the four bosses are spaced from the side wall ofthe first receiving container by a predetermined interval.

Also, a reflecting portion is extended from an end of the reflectingplate by a predetermined length. The reflecting portion may be bent toenclose an outer face of the light generating unit and may be furtherextended to cover an upper portion of the light generating unit.

At least one first penetrating hole corresponding to the boss formed onthe bottom of the first receiving container is formed at the reflectingplate, and the reflecting plate is guided to a receiving position bymeans of a combination between the at least one boss and the at leastone first penetrating hole.

The light generating unit includes a lamp having an integral body, forexample, of a laid U shape and the lamp is received between the at leastone boss and the side wall of the first receiving container. Thereflecting portion may have a first reflection portion, a secondreflection portion and a third reflection portion formed from ends ofthe reflecting plate corresponding to the lamp of the laid U shapehaving first and second bending portions. An upper face of the firstbending portion of the lamp is covered with an overlap of first endportions of the first and second reflection portions adjacent to thefirst bending portion, and an upper face of a second bending portion ofthe lamp is covered with an overlap of second end portions of the secondand third reflection portions adjacent to the second bending portion. Atthat time, the first end portion of the first reflection portioncovering the first bending portion is extended longer than the first endportion of the second reflection portion, and the second end portion ofthe third reflection portion covering the second bending portion isextended longer than the second end portion of the second reflectionportion.

At least one opening corresponding to a shape of the lamp is formed inthe bottom of the first receiving container to radiate a heat generatedfrom the lamp.

Also, the liquid crystal display device further includes diffusionsheets for enlarging a visual angle of the light emitted from the lightguiding plate to provide the light to the display unit, and thediffusion sheets are guided by a plurality of protuberances formed at anupper portion of a wall of the first receiving container.

Furthermore, the liquid crystal display device includes a top chassiscombined with the first receiving container for fixing the display unitreceived on the second receiving container to the second receivingcontainer, and a printed circuit board combined with the rear surface ofthe first receiving container for controlling operations of the lightgenerating unit and the display unit. A combining portion is formed bybeing partially extended from a side wall of the top chassis, and thecombining portion is combined with a ground terminal of the printedcircuit board.

The light generating unit includes a power supply line formed at bothends thereof to receive a driving power from outside. An isolation wallis formed on the bottom of the first receiving container spaced from oneside wall of the first receiving container, and the power supply line isguided from the first and the second receiving containers to outsidethrough a space between the isolation wall and the side wall.

In another aspect, there is provided a liquid crystal display devicehaving a display unit for displaying an image, a receiving container forreceiving the display unit, a power supplying unit for providing adriving power to the display unit, and a printed circuit board having anopening for receiving the power supplying unit. The power supplying unitis inserted and received in the opening of the printed circuit board.

The power supplying unit may be a transformer for converting a powerfrom outside into the driving power which is to be provided to thedisplay unit.

In further aspect, there is provided a liquid crystal display deviceincluding a display unit for displaying an image, a receiving containerfor receiving the display unit, a first printed circuit board installedbeneath a bottom of the receiving container wherein the first printedcircuit board has a power supplying unit for providing a driving powerto the display unit and a signal converting unit for converting a signalprovided to the display unit, a first connector installed on a secondprinted circuit board separated from the first printed circuit boardwherein the first connector is connected to the power supplying unitthrough a power supplying line for providing a power inputted fromoutside to the power supplying unit, a second connector installed on athird printed circuit board separated from the first and second printedcircuit boards wherein the second connector is connected to the signalconverting unit through a data transmitting line for providing a datasignal inputted from outside to the signal converting unit, a front casecombined with the display unit, and a rear case combined with the frontcase to receive the display unit. First and second openings, forreceiving the second and third printed circuit boards, are respectivelyformed in the front and rear cases to expose the first and secondconnectors, and the first and second connectors respectively received inthe first and second openings are movable to be apart from each other.

A third opening is formed in the first printed circuit board to receivethe power supplying unit and the power supplying unit is inserted in thethird opening by a predetermined depth. The power supplying unit may bea transformer for converting a power from outside into the driving powerwhich is to be provided to the display unit.

In still another aspect, there is provided a liquid crystal displaydevice including a light generating unit for generating a light, a lightguiding plate for guiding the light to a display unit for displaying animage, a reflection plate installed under the light guiding plate forreflecting the light to the light guiding plate, and a receivingcontainer for receiving the reflection plate, the light guiding plateand the light generating unit. An end of the reflection plate isextended by a predetermined length to form a reflecting portion, and thereflecting portion may be bent to enclose an outside of the lightgenerating unit and may be further extended to cover an upper face ofthe light generating unit.

According to the liquid crystal display device of the invention, thenumber of the parts installed in the liquid crystal display device canbe reduced and the manufacturing cost can be decreased because themanufacturing process is simplified in comparison with the liquidcrystal display device adopting a separate lamp cover.

Also, the transformer supplying the driving power to the lamp and theliquid crystal display panel is received in the opening formed in theprinted circuit board installed on the rear surface of the receivingcontainer by being inserted into a predetermined depth. Thus, the wholethickness of the liquid crystal device can be reduced as much as thedepth that the transformer is inserted into the opening.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects and advantages of the present invention willbecome readily apparent by reference to the following detaileddescription with reference to the accompanying drawings in which:

FIG. 1 is an exploded perspective view for schematically showing aliquid crystal display device according to an exemplary embodiment ofthe present invention;

FIGS. 2 and 3 are a perspective view and a plan view for illustrating alower mold frame shown in FIG. 1;

FIGS. 4 and 5 are a perspective view and a plan view for illustrating anupper mold frame shown in FIG. 1;

FIGS. 6 and 7 are a perspective view and a plan view for illustrating atop chassis shown in FIG. 1;

FIG. 8 is a perspective view for showing a reflection plate shown inFIG. 1;

FIG. 9 is a perspective view for showing a light guiding plate shown inFIG. 1;

FIG. 10 is a perspective view for showing a lamp shown in FIG. 1;

FIG. 11 is a perspective view for showing diffusion sheets shown in FIG.1;

FIG. 12 is a perspective view for showing a display unit shown in FIG.1;

FIG. 13 is a plan view for illustrating an assembled structure of thelower mold frame, the reflection plate and the lamp shown in FIG. 1;

FIGS. 14 and 15 are partially cut perspective views for illustrating theassembled structure of the lower mold frame, the reflection plate andthe lamp shown in FIG. 13;

FIG. 16 is a side view taken in a direction of A for showing the liquidcrystal display device shown in FIG. 13;

FIG. 17 is a partially cut perspective view for illustrating anassembled structure of the lower mold frame and a power supplying lineshown in FIG. 13;

FIG. 18 is a perspective view for showing an appearance of the assembledliquid crystal display device shown in FIG. 1;

FIG. 19 is a cross-sectional view taken along a line of B-B′ forillustrating an assembled structure of the liquid crystal display deviceshown in FIG. 18;

FIG. 20 is a cross-sectional view taken along a line of C-C′ forillustrating the assembled structure of the liquid crystal displaydevice shown in FIG. 18;

FIG. 21 is a plan view for showing a printed circuit board forcontrolling an operation of the liquid crystal display device shown inFIG. 18;

FIG. 22 is a perspective view for illustrating an assembled structure ofthe liquid crystal display device shown in FIG. 18 and the printedcircuit board shown in FIG. 21;

FIG. 23 is a cross-sectional view for showing an installation structureof a transformer shown in FIG. 22;

FIGS. 24 and 25 are perspective views for illustrating a power terminaland a data terminal shown in FIG. 21;

FIGS. 26 and 27 are a perspective view and a plan view for showing acase in which the liquid crystal display device is combined with theprinted circuit board shown in FIG. 22;

FIG. 28 is a perspective view for illustrating a front supportingportion shown in FIG. 27 and a power source and a data terminalsassembled with the front supporting portion;

FIG. 29 is a plan view for showing operations of the power source andthe data terminals assembled with the front supporting portion shown inFIG. 28;

FIG. 30 is a perspective view for illustrating an outer informationprocessing device assembled with the liquid crystal display device shownin FIG. 27; and

FIG. 31 is a schematic perspective view for illustrating an operationstate of the liquid crystal display device assembled with the outerinformation processing device shown in FIG. 30.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, a liquid crystal display device according to the exemplaryembodiment of the present invention will be described in detail withreference to the accompanying drawings.

FIG. 1 is an exploded perspective view for schematically showing aliquid crystal display device according to an exemplary embodiment ofthe present invention.

Referring to FIG. 1, the liquid crystal display device 1000 includes aliquid crystal display module for displaying an image when an imagesignal is applied thereto and a case (not shown) having front and rearcases for receiving the liquid crystal display module.

The liquid crystal display module includes a display unit 200 having aliquid crystal display panel for displaying the image and a back lightassembly 900 for providing a light to the display unit 200. The displayunit 200 is mounted on the back light assembly 900 and fixed thereon bymeans of a top chassis 100 combined with the back light assembly 900.

The back light assembly 900 has a lamp 500 generating the light, a lightguide plate 600 for guiding the light generated from the lamp 500 to thedisplay unit 200, a reflection plate 700 for reflecting the light fromthe light guide plate 600, a plurality of diffusion sheets 400 disposedon the light guide plate 600 for adjusting a visual angle of the light,a lower mold frame 800 for receiving the reflection plate 700, the lightguide plate 600, the lamp 500 and the diffusion sheets 400, and an uppermold frame 300 which is combined with the lower mold frame 800 and fixesthe reflection plate 700, the light guide plate 600, the lamp 500 andthe diffusion sheets 400. In FIG. 1, first and second diffusion sheets410 and 420 are shown, but of course it is understood that the number ofthe diffusion sheet is not limited to two (2).

Hereinafter, the display unit 200 and the back light assembly 900 of theliquid crystal display device 1000 will be described in detail withreference to the FIGS. 2 to 12.

FIGS. 1-3 are respectively a prospective view and a plan view forparticularly illustrating the lower mold frame 800 shown in FIG. 1.

Referring to FIGS. 2 and 3, the lower mold frame 800 has first, second,third and fourth walls 810, 812, 814 and 816 integrally connected oneafter another and first, second, third and fourth bottoms 820, 822, 824and 826 respectively extended from the first to fourth walls 810, 812,814 and 816. An opening having a predetermined shape is formed at acentral portion of the lower mold frame 800 and the opening is definedby the first to fourth bottoms 820, 822, 824 and 826 and exposes a rearsurface of the reflection plate 700.

First, second, third and fourth protuberances 832, 834, 836 and 838 arerespectively formed on the corners of the bottoms 820, 822, 824 and 826of the lower mold frame 800. The first to fourth protuberances 832, 834,836 and 838 are respectively spaced apart from the first to fourth walls810, 812, 814 and 816 by a predetermined interval. The first, second,third and fourth protuberances 832, 834, 836 and 838 fix the lamp 500and the light guide plate 600 in predetermined positions and prevent thelamp 500 from being damaged due to the movement of the light guide plate600. Such functions of the protuberances 832, 834, 836 and 838 will bedescribed later.

Meanwhile, a plurality of openings 828 having predetermined sizes areformed on the first, second and third bottoms 820, 822 and 824. The lamp500 is disposed on the first, second and third bottoms 820, 822 and 824of the lower mold frame 800 while the reflection plate 700 is interposedbetween the lamp 500 and the lower mold frame 800, and the heatgenerated from the lamp 500 can be easily radiated to an outside of thedevice through the openings 828. The openings 828 are only formed on thefirst, second and third bottoms 820, 822 and 824 since the lamp 500 ofthe liquid crystal display device 100 has the laid U shape. Thus, whenthe lamp 500 has a reversed L shape or a linear shape, the openings 828are formed only on the bottom on which the lamp 500 having the reversedL shape or the linear shape is disposed.

An isolation wall 840 that is spaced apart from the fourth wall 816 by apredetermined interval is formed on the fourth bottom 826 where theopenings are not formed so that a groove-shaped guide passage 846 isprovided between the fourth wall 816 and the isolation wall 840. A powersupplying line of the lamp 500 is guided by the guide passage 846 andextended toward the outside through a leader groove 850 formed bypartially opening a portion of the fourth wall 816.

As shown in FIG. 2, the leader groove 850 is formed at a predeterminedportion of the fourth wall 816 such that the leader groove 850 isadjacent to a the predetermined portion where a high voltage of the lamp500 is applied. Also, fifth and sixth protuberances 842 and 844 areformed on an upper end of the isolation wall 840 by a predeterminedinterval. The fifth and sixth protuberances 842 and 844 are inserted inengaging holes of the diffusion sheets 400 which are mounted on thelight guide plate 600, and guide the diffusion sheets 400 so that thediffusion sheets are placed at predetermined positions.

A plurality of protuberances are respectively formed on outer surfacesof the first to fourth walls 810, 812, 814 and 816 of the lower moldframe 800. First and second engaging protuberances 861 and 863 areformed on the first wall 810, and third and fourth engagingprotuberances 865 and 867 are formed on the fourth wall 816 facing thefirst wall 810. Also, a fifth engaging protuberance 869 is formed on thesecond wall 812. The first to fifth engaging protuberances 861, 863,865, 867 and 869 are respectively engaged with engaging holes of theupper mold frame 300 so that the first to fifth engaging protuberances861, 863, 865, 867 and 869 prevent the reflection plate 700, the lightguiding plate 600, the lamp 500 and the diffusion sheets 400 from beingmoved.

In addition, first and second fixing protuberances 871 a and 872 a areformed on the first wall 810 and third and fourth fixing protuberances873 a and 874 a are formed on the fourth wall 816. Fifth and sixthfixing protuberances 875 a and 876 a are formed on the second wall 812and seventh and eighth fixing protuberances 878 and 879 are formed onthe third wall 814 that faces the second wall 812. The first to eighthfixing protuberances 871 a, 872 a, 873 a, 874 a, 875 a, 876 a, 878 and879 are respectively combined with fixing holes formed on the topchassis 100 to fix the display unit 200 mounted on the upper mold frame300 to a predetermined position.

The first to sixth fixing protuberances 871 a, 872 a, 873 a, 874 a, 875a and 876 a are respectively formed on first, second, third, fourth,fifth and sixth embossings 871, 872, 873, 874, 875 and 876 which arerespectively protruded from the first, second and fourth walls 810, 812and 816. Therefore, the first to sixth fixing protuberances 871 a, 872a, 873 a, 874 a, 875 a and 876 a are extended further than the first tofifth engaging protuberances 861, 863, 865, 867 and 869. As a result,the first to sixth fixing protuberances 871 a, 872 a, 873 a, 874 a, 875a and 876 a can be easily combined with the fixing holes formed on thetop chassis 100.

FIGS. 4 and 5 are respectively perspective and plan views forillustrating the upper mold frame 300 shown in FIG. 1.

Referring to FIG. 1-5, a bottom 320 of the upper mold frame 300 isopened to have a size wider than an effective display area of thedisplay unit 200. The bottom 320 has a border portion 310 and side wallsare extended from ends of the border portion 310 to receive the displayunit 200. A side wall at one end of the border portion 310 of the bottom320 is opened so that a printed circuit board of the display unit 200 isbent toward one wall of the upper mold frame 300, and is easily guidedto the rear surface of the lower mold frame 800.

First and second engaging holes 331 and 333 are formed through the wallof the upper mold frame 300 corresponding to the first wall 810 of thelower mold frame 800. The first and second engaging holes 331 and 333are respectively engaged with the first and second engagingprotuberances 861 and 863. Third and fourth engaging holes 335 and 337are formed through the wall of the upper mold frame 300 corresponding tothe fourth wall 816 of the lower mold frame 800. The third and fourthengaging holes 335 and 337 are respectively engaged with the third andfourth engaging protuberances 865 and 867. Also, a fifth engaging hole339 is formed through the wall of the upper mold frame 300 correspondingto the second wall 812 of the lower mold frame 800. The fifth engaginggroove 339 is engaged with the fifth engaging protuberance 869.

As described above, the upper mold frame 300 is combined with the lowermold frame 800 by engaging the first to fifth engaging protuberances861, 863, 865, 867 and 869 of the lower mold frame 800 with the first tofifth engaging holes 331, 333, 335, 337 and 339 of the upper mold frame300, respectively.

In addition, first and second guide grooves 340 and 341 are formed onthe wall of the upper mold frame 300 corresponding to the first wall 810of the lower mold frame 800 by partially removing the wall of the uppermold frame 300 to expose the first and second embossings 871 and 872.Third and fourth guide grooves 343 and 345 are formed on the wall of theupper mold frame 300 corresponding to the fourth wall 816 of the lowermold frame 800 by partially removing the wall of the upper mold frame300 to expose the third and fourth embossings 873 and 874. Also, fifthand sixth guide grooves 347 and 349 are formed on the wall of the uppermold frame 300 corresponding to the second wall 812 of the lower moldframe 800 by partially removing the wall of the upper mold frame 300 toexpose the fifth and sixth embossings 875 and 876. Hence, the first toeighth fixing protuberances 871 a, 872 a, 873 a, 874 a, 875 a, 876 a,878 and 879 for fixing the top chassis 100 are sufficiently exposed fromthe upper mold frame 300.

FIGS. 6 and 7 are respectively perspective and plan views forparticularly illustrating the top chassis 100 shown in FIG. 1.

Referring to FIGS. 1-7, the bottom 110 of the top chassis 100 ispartially opened to expose the effective display area of the displayunit 200 and the top chassis 100 includes walls respectivelycorresponding to the first to fourth walls 810, 812, 814 and 816 of thelower mold frame 800. The top chassis 100 is combined with the lowermold frame 800 to fix the display unit 200 on the upper mold frame 300.For this purpose, first and second fixing holes 121 and 122 are formedthrough the wall of the top chassis 100 corresponding to the first wall810 of the lower mold frame 800, and the first and second fixing holes121 and 122 are respectively engaged with the first and second fixingprotuberances 871 a and 872 a. Third and fourth fixing holes 123 and 124are formed through the wall of the top chassis 100 corresponding to thefourth wall 816 of the lower mold frame 800, and the third and fourthfixing holes 123 and 124 are respectively engaged with the third andfourth fixing protuberances 873 a and 874 a.

Also, fifth and sixth fixing holes 125 and 126 are formed through thewall of the top chassis 100 corresponding to the second wall 812 of thelower mold frame 800, and the fifth and sixth fixing holes 125 and 126are respectively engaged with the fifth and sixth fixing protuberances875 a and 876 a. Seventh and eighth fixing holes 127 and 128 are formedthrough the wall of the top chassis 100 corresponding to the third wall814 of the lower mold frame 800, and the seventh and eighth fixing holes127 and 128 are respectively engaged with the seventh and eighth fixingprotuberances 878 and 879.

As described above, when the first to eighth fixing protuberances 871 a,872 a, 873 a, 874 a, 875 a, 876 a, 878 and 879 of the lower mold frame800 are correspondently engaged with the first to eighth fixing holes121, 122, 123, 124, 125, 126, 127 and 128 of the top chassis 100, themovement and the separation of the display unit 200 on the upper moldframe 300 can be prevented. In addition, a flexible printed circuitboard of the display unit 200 is bent by means of the wall of the topchassis 100 correspondingly combined with the third wall 814 of thelower mold frame 800.

Portions of the walls of the top chassis 100 respectively correspondingto the first and fourth walls 810 and 816 of the lower mold frame 800,are perpendicularly protruded to form first to fourth fixing pieces 132,134, 136 and 138.

The liquid crystal display device 1000 assembled as above-described isinstalled in a printed circuit board (not shown) having an invertercircuit and an A/D circuit for supplying a power to drive the displayunit 200 and the back light assembly 900. The first to fourth fixingpieces 132, 134, 136 and 138 are combined with fixing holes formed onthe printed circuit board, for example, by screws, combining the liquidcrystal device 100 and the printed circuit board (not shown). Also, thefirst to fourth fixing pieces 132, 134, 136 and 138 function as groundpieces for grounding the top chassis 100 while combining with the fixinggrooves of the printed circuit board (not shown). Such function of thefixing pieces 132, 134, 136 and 138 will be described later.

Hereinafter, structures will be described of the reflection plate 700,the light guide plate 600, the lamp 500 and the diffusion sheets 400received between the upper mold frame 300 and the lower mold frame 800,as well as the structure of the display unit 200 received between theupper mold frame 300 and the top chassis 100.

FIG. 8 is a perspective view for showing the reflection plate shown inFIG. 1, FIG. 9 is a perspective view for illustrating the light guidingplate shown in FIG. 1, FIG. 10 is a perspective view for showing thelamp shown in FIG. 1, FIG. 11 is a perspective view for illustrating thediffusion sheets shown in FIG. 1, and FIG. 12 is a perspective view forshowing the display unit shown in FIG. 1.

Referring to the figures and particularly to FIG. 8, the reflectionplate 700 has a reflection bottom 710 for reflecting the light from thelight guide plate 600 toward the display unit 200, and first, second andthird reflection walls 720, 730 and 740 for reflecting the lightgenerated form the lamp 500 toward the light guide plate 600.

The first, second and third reflection walls 720, 730 and 740 arerespectively extended from the ends corresponding to the first to thirdwalls 810, 812 and 814 of the lower mold frame 800. Particularly, thefirst to third reflection walls 720, 730 and 740 include first, secondand third reflection side walls 722, 732 and 742 enclosing an outside ofthe lamp 500, and first, second and third reflection covers 724, 734 and744 for covering the lamp 500. The first to third reflection side walls722, 732 and 742 are perpendicular to the reflection bottom 710. Thefirst to third reflection covers 724, 734 and 744 are bent from thefirst to third reflection side walls 722, 732 and 742 parallel with thereflection bottom 710. The second and third reflection covers 734 and744 have first and second wings 736 and 746 protruded therefrom at anend portion adjacent to the first reflection wall 720.

First and second insertion holes 752 and 754 and first and secondinsertion grooves 756 and 758 are formed at four corners of thereflection bottom 710, and the first and second insertion holes andgrooves 752, 754, 756 and 758 respectively correspond to the first tofourth protuberances 832, 834, 836 and 838 formed at the four corners ofthe bottom of the lower mold frame 800.

Referring to FIG. 9, the lamp 500 has the laid U shape having first andsecond bending portions 512 and 514. A first power supplying line 532for applying a high voltage to the lamp 500 is electrically connected toone end of the lamp 500 and a second power supplying line 534 forapplying a low voltage to the lamp 500 is electrically connected to theother end of the lamp 500. First and second lamp holders 522 and 524 arerespectively combined with opposite ends of the lamp 500 to maintain theconnection state between the lamp 500 and a power supplying line 530including the first power supplying line 532 and the second powersupplying line 534. The method for mounting the lamp 500 on the lowermold frame 800 will be described later.

Referring to the figures, particularly to FIG. 10, the light guide plate600 has a shape of a rectangular plate corresponding to the display unit200 and ends of the light guide plate 600 have a same thickness to forman edge type. Printed patterns (not shown) are formed on the light guideplate 600 for increasing the reflection efficiency of the light emittedfrom the lamp 500, and an interval between two adjacent printed patternsgets smaller as the printed patterns are spaced more apart from the lamp500.

Four corners of the light guide plate 600 are partially cut to preventthe light guide plate 600 from being moved when the light guide plate600 is mounted on the lower mold frame 800, thereby forming first,second, third and fourth clamping jaws 612, 614, 616 and 618.

Referring to FIG. 11, the diffusion sheets 400 include a first diffusionsheet 410 and a second diffusion sheet (not shown) respectively havingdifferent visual angle directions with respect to the light. That is,the first diffusion sheet 410 diffuses the light emitted from the lightguide plate 600 in the x-axis direction when the second diffusion sheet(not shown) diffuses the light emitted from the light guide plate 600 inthe y-axis direction, so the visual angle of the image displayed throughthe display unit 200 can be enlarged as a whole.

The first diffusion sheet 410 has a shape identical to that of thesecond diffusion sheet 420. In particular, ends of the first and thesecond diffusion sheets 410 and 420 are respectively extended to formfirst and second protruding portions 412 and 414. Seventh and eighthengaging holes 412 a and 414 a engaged with the fifth and sixthprotuberances 842 and 844 formed on the isolation wall 840 of the lowermold frame 800 are respectively formed in the first and secondprotruding portions 412 and 414.

Referring to FIG. 12, the display unit 200 for displaying the imagecorresponding to the light which is generated from the lamp 500 andpassed through the light guide plate 600 and the diffusion sheets 400,is provided on the upper mold frame 300 that is disposed on thediffusion sheets 400.

The display unit 200 includes a liquid crystal display panel 210, a gatedriver integrated circuit (IC) 220, a data driver integrated circuit(IC) 230, and a flexible printed circuit board 240 on which wiringpatterns are formed for transmitting gate and data driving signals tothe gate driver IC 220 and the data driver ICs 230 provided from agate-and-data printed circuit board (not shown). The gate driver IC 220is formed at one portion of the liquid crystal display panel 210 and thedata driver integrated circuits 230 are formed at the other portion ofthe liquid crystal display panel 210. A signal transmitting line fortransmitting the gate driving signal to the gate driver IC 220 isextended to the flexible printed circuit board 240 through an inactiveregion of the liquid crystal display panel 210. That is, the patterns ofthe signal transmitting line of the gate driver IC 220 and data driverICs 230 are integrally formed on the flexible printed circuit board 240,and a connection terminal 250 is formed at the end of the flexibleprinted circuit board 240. The connection terminal 250 is electricallyconnected to the gate-and-data printed circuit boards of the printedcircuit board (not shown) which is combined with the rear surface of theliquid crystal display device 1000.

The liquid crystal display panel 210 has a thin film transistorsubstrate 214, a color filter substrate 212 and a liquid crystal (notshown).

The thin film transistor substrate 214 includes a transparent glasssubstrate on which thin film transistors in a matrix shape are formed. Adata line is connected to source terminals of the thin film transistorsand a gate line is connected to the gate terminals of the thin filmtransistors. Also, a pixel electrode is connected to each of the drainterminals of the thin film transistors and the pixel electrode isgenerally formed of a transparent conductive material such as Indium TinOxide (ITO).

When electric signals are applied to the data and the gate lines, theelectrical signals are transmitted to the source and the gate terminalsof the thin film transistors, turning on or off the thin filmtransistors and outputting electrical signals for the formation of thepixel through the drain terminals of the thin film transistors.

The color filter substrate 212 is provided to face the thin filmtransistor substrate 214. RGB pixels are formed on the color filtersubstrate 212, for example, via a thin film processing, and give apredetermined color while the light passes through the color filtersubstrate 212. Common electrodes made of the ITO are coated on a frontsurface of the color filter substrate 212.

When the thin film transistors are turned on by applying a power sourceto the gate terminals and the source terminals of the thin filmtransistors of the thin film transistor substrate 214, an electric fieldis generated between the pixel electrodes and the common electrodes ofthe color filter substrate 212. The alignment angle of the liquidcrystal injected between the thin film transistor substrate 214 and thecolor filter substrate 212 is changed according to the electric field,and then the light transmissivity is changed to obtain a desired pixelin accordance with the changed alignment angle of the liquid crystal.

To control the alignment angle and the alignment timing of the liquidcrystal of the liquid crystal display panel 210, driving and timingsignals applied to the gate and the data lines of the thin filmtransistor are provided from the gate-and-data printed circuit board(not shown) through the signal transmitting lines of the gate driver IC220 and the data driver ICs 230. Namely, the gate-and-data printedcircuit board (not shown) generates the gate driving and the datasignals for driving the liquid crystal display 1000 and a plurality oftiming signals for properly applying the gate driving and the datasignals, and then the gate driving signal is applied to the gate line ofthe liquid crystal panel 210 through the gate driver IC 220 and the datasignal is applied to the data line of the liquid crystal panel 210through the data driver ICs 230.

Hereinafter, the assembled structure of the above-described liquidcrystal display device will be described with reference to FIGS. 13 to19.

FIG. 13 is a plan view for showing the assembled structure in which thereflection plate and the lamp are assembled with the lower mold frameshown in FIG. 1 and FIGS. 14 and 15 are partially cut perspective viewsfor illustrating the assembled structure of the upper mold frame, thereflection plate and the lamp shown in FIG. 13.

As shown in FIG. 13, the first to fourth protuberances 832, 834, 836 and838 formed on the first to fourth bottoms 820, 822, 824 and 826 of thelower mold frame 800 respectively correspond to the first and secondinsertion holes and grooves 752, 754, 756 and 758 formed on thereflection bottom 710 of the reflection plate 700, thereby combining thereflection plate 700 with the lower mold frame 800.

The first to fourth protuberances 832, 834, 836 and 838 respectivelypenetrating the first and second insertion holes and grooves 752, 754,756 and 758 prevent the reflection plate 700 received on the lower moldframe 800 from being moved. The first to third reflection walls 720, 730and 740 of the reflection plate 700 are bent corresponding to the firstto third side walls 810, 812 and 814 of the lower mold frame 800 in adirection perpendicular to the bottom of the lower mold frame 800.

The lamp 500 having the laid U shape is received in the lower mold frame800 along the first to third side walls 810, 812 and 814 of the lowermold frame 800, after the reflection plate 700 is received in the lowermold frame 800. Particularly, the first bending portion 512 of the lamp500 having the laid U shape is placed between the first protuberance 832of the lower mold frame 800 and the first side wall 810 and the secondside wall 812, and the second bending portion 514 of the lamp 500 havingthe laid U shape is placed between the second protuberance 834 of thelower mold frame 800, and the first side wall 810 and the third sidewall 814. Also, the first lamp holder 522 of the lamp 500 is placedbetween the third protuberance 836 of the lower mold frame 800, and thesecond side wall 812 and the fourth side wall 816, and the second lampholder 524 of the lamp 500 is placed between the fourth protuberance 838of the lower mold frame 800, and the third side wall 814 and the fourthside wall 816.

As described above, when the lamp 500 is received in the lower moldframe 800, the position of the received lamp 500 generally correspondsto the openings 828 formed in the bottom of the lower mold frame 800.That is, the lamp 500 is mounted at the position corresponding to theopenings 828 for radiating the heat generated from the lamp 500.

As shown in FIGS. 14 and 15, the first and second wings 736 and 746formed on the second and third reflection covers 734 and 744 fully coverthe first and second protuberances 832 and 834 when the first to thirdreflection covers 724, 734 and 744 are bent to cover the upper surfaceof lamp 500. Although not shown in FIGS. 14 and 15, the first and secondclamping jaws 612 and 614 of the light guide plate 600 shown in FIG. 10are covered by the first and second wings 736 and 746.

If the first and second wings 736 and 746 are not formed, the first andsecond protuberances 832 and 834, and the first and second clamping jaws612 and 614 are not completely covered by the first to third reflectioncovers 724, 734 and 744, so the light generated from the lamp 500 may beleaked.

Alternatively, both ends of the first reflection cover 724 are extendedin the same manner as in the first and the second wings 736 and 746. Theextended ends of the first reflection cover 724 may replace the firstand second wings 736 and 746 of the second and the third reflectioncovers 734 and 744 covering the first and second protuberances 832 and834 and the first and the second clamping jaws 612 and 614 of the lightguide plate 600.

FIG. 16 is a side view for showing the liquid crystal display deviceshown in FIG. 13 along the direction of A and FIG. 17 is partially cutperspective view for illustrating the assembled structure of the lowermold frame and the power supplying line shown in FIG. 13.

The first and second power supplying lines 532 and 534 are electricallyconnected to opposite ends of the lamp 500 as shown in FIG. 9. The firstpower supplying line 532 provides the high voltage to one end of thelamp 500 and the second power supplying line 534 maintains the other endof the lamp 500 as a ground level.

The first and second power supplying lines 532 and 534 are guided to theleader groove 850 through the guide passage 846 formed by the isolationwall 840 and the fourth side wall 816 of the lower mold frame 800 asshown in FIG. 17. In addition, the first and second power supplyinglines 532 and 534 are inserted in the leader groove 850 to be extendedtoward outside. If the leader groove 850 is adjacently formed to acentral portion of the fourth side wall 816 or the fourth protuberance838, the first power supplying line 532 for applying the high voltagefrom outside to the lamp 500 may be equal to or longer than the secondpower supplying line 534. So, it is preferable that the leader groove850 is adjacently formed to the third protuberance 836 on the fourthside wall 816 as shown in FIG. 2.

In a case where the first power supplying line 532 for applying the highvoltage to the lamp 500 is longer than the second power supplying line534, circuit parts of the liquid crystal display device 1000 adjacent tothe first power supplying line 532 may be mis-operated by the heatgenerated due to the high voltage provided through the first powersupplying line 532. Therefore, as shown in FIGS. 2, 16 and 17, thesecond power supplying line 534 maintained as the ground level is longerthan the first power supplying line 532, and the leader groove 850 isformed adjacent to the third protuberance 836 on the fourth side wall816.

The assembly process and the assembled structure of the liquid crystaldisplay device shown in FIG. 1 will be described with reference to FIG.18 to 20.

FIG. 18 is a perspective view for showing an appearance of the assembledliquid crystal display device shown in FIG. 1 after the liquid crystaldisplay device is assembled, FIG. 19 is a cross-sectional view takenalong B-B′ for illustrating the assembled structure of the liquidcrystal display device shown in FIG. 18, and FIG. 20 is across-sectional view taken along C-C′ for illustrating the assembledstructure of the liquid crystal display device shown in FIG. 18.

After the reflection plate 700, the lamp 500, the light guide plate 600and the diffusion sheets 400 are successively received in the lower moldframe 800 shown in FIG. 13, the upper mold frame 300 is combined withthe lower mold frame 800. Subsequently, the display unit 200 is mountedon the upper mold frame 300 and the top chassis 100 is combined with thelower mold frame 800, thereby completing the liquid crystal displaydevice shown in FIG. 18.

Hereinafter, the assembly process and the assembled structure of theliquid crystal display device shown in FIG. 18 will be described withreference to FIGS. 19 and 20.

After the reflection plate 700 and the lamp 500 are received in thelower mold frame 800, the light guide plate 600 is mounted on thereflection bottom 710 of the reflection plate 700 so that the first tofourth clamping jaws 612, 614, 616 and 618 are respectively coupled withthe first to fourth protuberances 832, 834, 836 and 838. The first tofourth protuberances 832, 834, 836 and 838 prevent the lamp 500 and thelight guide plate 600 from being moved and the lamp 500 from beingdamaged due to the movement of the light guide plate 600.

Then, the diffusion sheets 400 are placed on the light guide plate 600.The diffusion sheets 400 are guided to a proper position by insertingthe fifth and sixth protuberances 842 and 844 of the isolation wall 840into the seventh and eighth engaging holes 412 a and 414 a respectivelyformed on the first and second protruding portions 412 and 414 asdescribed above. The first and second power supplying lines 532 and 534of the lamp 500 are already extended to outside through the guidepassage 846 and the leader groove 850.

Also, the fifth and sixth protuberances 842 and 844 of the isolationwall 840 are formed to be protruded from the guide passage 846 toprevent the first and second power supplying lines 532 and 534 receivedin the guide passage 846 from separating from the guided passage 846.Alternatively, for pressing the first and second power supplying lines532 and 534, protruding portions can be formed at predetermined portionsof the isolation wall 840, thereby preventing the first and second powersupplying lines 532 and 534 from being separated from the isolation wall840.

As shown in FIGS. 19 and 20, the first to third reflection covers 724,734 and 744 are bent to cover the upper surface of the lamp 500. Theupper mold frame 300 is fixedly combined with the lower mold frame 800by respectively engaging the first to fifth engaging holes 331, 333,335, 337 and 339 formed on the side wall of the upper mold frame 300with the first to fifth engaging protuberances 861, 863, 865, 867 and869. Also, the reflection plate 700, the light guide plate 600, the lamp500 and the diffusion sheets 400 can be stably maintained between theupper mold frame 300 and the lower mold frame 800. The bottoms of thediffusion sheets 400 are exposed by the opened bottom of the upper moldframe 300.

Subsequently, after the display unit 200 is mounted on the upper moldframe 300, the top chassis 100 is combined with the lower mold frame 800so that the top chassis 100 pressurizes a predetermined portion of endportions of the display unit 200.

The top chassis 100 is fixedly combined with the lower mold frame 800 byrespectively combining the first to eighth fixing holes 121, 122, 123,124, 125, 126, 127 and 128 formed through the side wall of the topchassis 100 with the first to eighth fixing protuberances 871 a, 872 a,873 a, 874 a, 875 a, 876 a, 878 and 879 formed on the lower mold frame800.

The above-mentioned liquid crystal display device 1000 requires adriving power and an image data signal for performing its own function.

It will be described that the printed circuit board having an invertercircuit for providing the driving power and a data converting circuit(A/D circuit) for providing the image data signal and a case forreceiving the liquid crystal display device with reference to FIGS. 21and 22.

FIG. 21 is a plan view for showing the printed circuit board forcontrolling the operation of the liquid crystal display device shown inFIG. 18, and FIG. 22 is a perspective view for illustrating the liquidcrystal display device shown in FIG. 18 assembled with the printedcircuit board shown in FIG. 21.

Referring to FIGS. 21 and 22, first, second, third and fourth groundpatterns 132 a, 134 a, 136 a and 138 a are formed on the printed circuitboard 1100 corresponding to the first, second, third and fourth fixingpieces 132, 134, 136 and 138 of the top chassis 100.

Also, the printed circuit board 1100 is partially removed so that blindholes corresponding to penetrating holes formed through the first tofourth fixing pieces 132, 134, 136 and 138 are formed in the first tofourth ground patterns 132 a, 134 a, 136 a and 138 a.

The upper and the lower portions of the printed circuit board 1100 arecut to form first and second receiving portions 1110 and 1120 on upperface and lower faces of the printed circuit board 1100.

A transformer 1130 of the inverter circuit is received in the firstreceiving portion 1110 and the transformer 1130 of the inverter circuitprovides a predetermined voltage level to the lamp 500 and the displayunit 200 after it receives the driving voltage for the liquid crystaldisplay device from outside and converts the driving voltage to thepredetermined voltage level. For this purpose, a power terminal 1150 iselectrically connected to the lower portion of the printed circuit board1100 for providing the driving voltage from outside to the transformer1130.

When the liquid crystal display device 1000 is combined with the printedcircuit board 1100, the flexible printed circuit board 240 of thedisplay unit 200, which is bent toward a rear side of the lower moldframe 800, is guided to the lower face of the printed circuit board 1100through the second receiving portion 1120 according to the combinationof the top chassis 100 and the lower mold frame 800.

The connection terminal 250 of the flexible printed circuit board 240 isconnected to a connector (not shown) disposed on the lower face of theprinted circuit board 1100 for providing the image data signal and thedriving power for the display unit 200. To achieve this performance, adata terminal 1160 is connected to the lower portion of the printedcircuit board 1100. The data terminal 1160 receives the image datasignal from outside, and then provides the image data signal to theprinted circuit board 1100. In addition, an A/D circuit 1140 isinstalled on a predetermined portion of the printed circuit board 1100.The A/D circuit 1140 converts the image data signal having an analoguetype inputted through the data terminal 1160 into a digital image datasignal, and then provides the digital image signal to the connectorconnected to the connection terminal 250.

As shown in FIG. 22, the liquid crystal display device 1000 is fixed onthe printed circuit board 1100 by first, second, third and fourth screws132 b, 134 b, 136 b and 138 b which are inserted into the penetratingholes of the first to fourth fixing pieces 132, 134, 136 and 138 and areengaged with the blind holes of the first to fourth ground patterns 132a, 134 a, 136 a and 138 a.

FIG. 23 is a cross-sectional view for illustrating the transformer shownin FIG. 22 which is installed in the printed circuit board.

To install the transformer 1130 of the inverter circuit, the firstreceiving portion 1110 having a predetermined size is formed through theprinted circuit board 1100. The transformer 1130 is received into thefirst receiving portion 1110, thereby minimizing the thickness of theprinted circuit board 1100. That is, the overall thickness of theprinted circuit board 1100 on which various circuit parts are installedincreases as the thickness “t2” of the transformer 1130 is added to thethickness of “t1” of the printed circuit board 1100 when the transformer1130 is installed on the printed circuit board 1100. However, when thetransformer 1130 is received in the first receiving portion 1110 afteran opening is formed in the printed circuit board 1100 as the firstreceiving portion 1110, the overall thickness of the printed circuitboard 1100 having the transformer 1130 thereon is reduced as much as thethickness of “t1”. Thus, the height of the transformer 1130 received inthe first receiving portion 1110 is lower than that of the liquidcrystal display device 1000 installed on the printed circuit board 1100,thereby reducing the overall thickness of the printed circuit board1100.

The power terminal 1150 and data terminal 1160 are installed ondifferent printed circuit boards as shown in FIG. 21.

FIGS. 24 and 25 are perspective views for showing the structures of thepower and the data terminals shown in FIG. 21.

Referring to FIG. 24, the power terminal 1150 includes a first printedcircuit board 1151 which is electrically connected to the printedcircuit board 1100 through a first signal transmitting line 1152, and afirst connector 1153 having a first neck 1155 installed on the firstprinted circuit board 1151.

Referring to FIG. 25, the data terminal 1160 includes a second printedcircuit board 1161 which is electrically connected to the printedcircuit board 1100 through a second signal transmitting line 1162, and asecond connector 1163 having a second neck 1165 installed on the secondprinted circuit board 1161. The power and data terminals 1150 and 1160are separately installed in a case of the liquid crystal display device1000.

That is, the first connector 1153 receiving the driving power fromoutside and the second connector 1163 receiving the image data signalare separately installed on the first and second printed circuit boards1151 and 1161, respectively. Such a separate installation isadvantageous as described below.

FIG. 26 is a perspective view for illustrating the case in which theliquid crystal display device is combined with the printed circuit boardand FIG. 27 is a plan view for showing the case in which the liquidcrystal display device is combined with the printed circuit board.

Referring to FIGS. 26 and 27, the case 1200 has a front case 1210including a bottom where an opening having a predetermined size isformed to expose the effective display area of the display unit 200, anda rear case 1220 combined with the front case 1210.

Also, the case 1200 has a supporting portion 1242 including a frontsupporting portion 1230 for receiving the power and the data terminals1150 and 1160, and a rear supporting portion 1240 that faces the frontsupporting portion 1230 and is combined with the front supportingportion 1230. The front and rear supporting portions 1230 and 1240 arerespectively combined with the front and the rear cases 1210 and 1220 byusing hinges 1250 to move the liquid crystal display device 1000 asshown in FIG. 26.

Openings having predetermined sizes are formed at the front supportingportion 1230 for receiving the first connector 1153 of the powerterminal 1150 and the second connector 1163 of the data terminal 1160.Such openings are called as third and fourth receiving portions 1231 and1233 for receiving the first and the second connectors 1153 and 1163,respectively.

As shown in FIG. 27, the third and fourth receiving portions 1231 and1233 are respectively wider than the first and second connectors 1153and 1163. Hence, the first and second connectors 1153 and 1163 receivedin the third and fourth receiving portions 1231 and 1233 can move in theleft or the right direction, so that the liquid crystal display device1000 may be easily connected with an external information processingdevice providing the driving power and the image data signal to theliquid crystal display device.

The assembled structure of the front supporting portion 1230, the powerterminal 1150 and the data terminal 1160 will be described in detailwith reference to FIGS. 28 and 29.

FIG. 28 is a perspective view for showing the bottom structure of thefront supporting portion shown in FIG. 27 and the structures of thepower and the data terminals combined with the front supporting portion,and FIG. 29 is a plan view for illustrating the operation states of thepower and the data terminals combined with the front supporting portionshown in FIG. 28.

Referring to FIG. 28, a first supporting stand 1232 for supporting thefirst printed circuit board 1151 having the first connector 1153 whichis received in the third receiving portion 1231, is formed on the bottomof the front supporting portion 1230 under the third receiving portion1231. A second supporting stand 1235 for supporting the second printedcircuit board 1161 where the data terminal 1165 is installed, is formedon the front supporting portion 1230 under the fourth receiving portion1233.

Also, first and second stopper 1234 a and 1234 b are formed between thethird receiving portion 1231 and the first supporting stand 1232 tocontrol the movement of the first connector 1153 received in the thirdreceiving portion 1231 in the left or the right direction. Inparticular, the first stopper 1234 a is positioned over one portion ofthe first supporting stand 1232 and is spaced apart from the upper faceof the first supporting stand 1232. The second stopper 1234 b ispositioned over the other portion of the first supporting stand 1232 andis spaced apart from the upper face of the first supporting stand 1232.The first and second stoppers 1234 a and 1234 b are sufficiently spacedapart from the upper face of the first supporting stand 1232 to receivethe first printed circuit board 1151. In addition, the interval betweenthe first stopper 1234 a and the second stopper 1234 b is larger thanthe width of the first neck 1155 of the first connector 1153.

Therefore, when the first connector 1153 is received in the thirdreceiving portion 1231 by supporting the first supporting stand 1232 asshown in FIG. 29, the interval of “L1” exists between the first neck1155 of the first connector 1153 and the first stopper 1234 a and theinterval of “L2” exists between the first neck 1155 of the firstconnector 1153 and the second stopper 1234 b. The rear supportingportion 1240 combined with the front supporting portion 1230 preventsthe power terminal 1150 from separating from the front supportingportion 1230.

Also, third and fourth stoppers 1236 a and 1236 b are formed by apredetermined interval between the fourth receiving portion 1233 and thesecond supporting stand 1235 to control the movement of the secondconnector 1163 received in the fourth receiving portion 1233 in the leftor the right direction. Particularly, the third stopper 1236 a ispositioned over one portion of the second supporting stand 1235 and isspaced apart from the upper face of the second supporting stand 1235.The fourth stopper 1236 b is positioned over the other portion of thesecond supporting stand 1235 and is spaced apart from the upper face ofthe second supporting stand 1235. The third and fourth stoppers 1236 aand 1236 b are sufficiently spaced apart from the upper face of thesecond supporting stand 1235 to receive the second printed circuit board1161. In addition, the interval between the third stopper 1236 a and thefourth stopper 1236 b is larger than the width of the second neck 1165of the second connector 1163.

Therefore, when the second connector 1163 is received in the fourthreceiving portion 1233 by supporting the second supporting stand 1235 asshown in FIG. 29, the interval of “L3” exists between the second neck1165 of the second connector 1163 and the third stopper 1236 a and theinterval of “L4” exists between the second neck 1165 of the secondconnector 1163 and the fourth stopper 1236 b. The rear supportingportion 1240 combined with the front supporting portion 1230 preventsthe data terminal 1160 from being separated from the front supportingportion 1230.

The liquid crystal display device assembled with an external informationprocessing device will be described with reference to FIGS. 30 and 31.

FIG. 30 is a perspective view for illustrating the configuration of theexternal information processing device assembled with the liquid crystaldisplay device shown in FIG. 27, and FIG. 31 is a schematic perspectiveview for showing the operation state of the liquid crystal displaydevice assembled with the external information processing device shownin FIG. 31.

Referring to FIG. 30, a fifth receiving portion 1320 is formed on therear surface of the external information processing device 1300 forreceiving the front and rear supporting portions 1230 and 1240 of thecase 1200. The rear face of the external information processing device1300 is partially recessed to form the fifth receiving portion 1320.Also, a sixth receiving portion 1330 for receiving the front and rearcases 1210 and 1220 is extended from the fifth receiving portion 1320 tothe upper face of the external information processing device 1300.

Third and fourth connectors 1342 and 1344 are formed on the bottom ofthe fifth receiving portion 1320. The third and fourth connectors 1342and 1344 are connected to a power supplying and an informationprocessing section installed in the external information processingdevice 1300 to provide the driving power and the image data signal tothe first and second connectors 1153 and 1163.

In general, the third and fourth connectors 1342 and 1344 of theexternal information processing device 1300 are fixedly installed atspecific positions. Namely, the interval between the third connector1342 and the fourth connector 1344 is maintained at a predetermineddistance determined during the manufacture process of the externalinformation processing device 1300. Thus, when the first and secondconnectors 1153 and 1163 are fixedly installed at specific positions,the first and second connectors 1153 and 1163 may not be preciselyconnected to the third and fourth connectors 1342 and 1344 due to theminute processing errors which may occur during the manufacturingprocess of the external information processing device 1300 or the liquidcrystal display device 1000.

To prevent such a problem, when the liquid crystal display device 1000received in the case 1200 is combined with the external informationprocessing device 1300, the first and second connectors 1153 and 1163are movable in the left or the right direction so that the intervalbetween the first connector 1153 and the second connector 1163 ismaintained at a distance identical to the interval between the thirdconnector 1342 and the fourth connector 1344 as shown in FIG. 31.

When the supporting portion 1242 is inserted in the fifth receivingportion 1320 so as to electrically connect the first and secondconnectors 1153 and 1163 with the third and fourth connectors 1342 and1344, the liquid crystal display device 1000 is electrically coupled tothe external information processing device 1300 as shown in FIG. 31.

The front and rear supporting portions 1230 and 1240 are combined withthe front and rear cases 1210 and 1220 by the hinge 1250. Therefore, auser can utilize the liquid crystal display device 1000 in an uprightposition in a case where a certain information processing is performedby means of the external information processing device 1300 and theliquid crystal display device 1000. Also, the user can keep the liquidcrystal display device 1000 received in the sixth receiving portion 1330when the user does not use the liquid crystal display device 1000.

According to the liquid crystal display device of the present inventiondescribed above, at least one boss is formed on the bottom of a retainerfor receiving the lamp generating the light and the light guide plate,and the boss guides the lamp and the light guiding plate to properpositions, thereby preventing the movement and the collision of the lampand the light guide plate. Also, the end portion of the reflection platefor reflecting the light under the light guide plate is extended to theupper face of the lamp, thereby enclosing the outside of the lamp.Therefore, the number of the parts installed in the liquid crystaldisplay device can be reduced, and the manufacturing cost can bedecreased because the manufacturing process is simplified in comparisonwith the liquid crystal display device including a separate lamp cover.

Also, the transformer providing the driving power to the lamp and theliquid crystal display panel is received in the opening formed in theprinted circuit board installed on the rear face of the retainer by apredetermined depth. Hence, the overall thickness of the liquid crystaldisplay device can be reduced as much as the depth that the transformeris inserted into the opening.

Furthermore, the first and second connectors are respectively installedon the first and second printed circuit boards separated from theprinted circuit board. The first and second connectors provide the imagedata signal and the driving power from outside to the power supplyportion and signal converting portion formed on the printed circuitboard. In addition, the first and second openings for receiving thefirst and second connectors have the sizes in which the first and secondconnectors can move toward each other or be spaced apart from eachother. Thus, the interval between the first connector and the secondconnector can be adjusted according to the interval between theconnectors installed on the external information processing device,thereby easily accomplishing the electrical connection between theliquid crystal display device and the external information processingdevice.

Although the exemplary embodiments of the present invention have beendescribed, it is understood that the present invention should not belimited to these embodiments but various changes and modifications canbe made by one skilled in the art within the spirit and scope of thepresent invention as hereinafter claimed.

1. A liquid crystal display comprising: display means for displaying animage; receiving means for receiving said display means; power supplyingmeans for providing a driving power to said display means; and a printedcircuit board having an opening for receiving said power supplyingmeans, wherein said power supplying means is inserted into the openingof said printed circuit board to be received, the opening of the printedcircuit board is formed outside of a region where the display means andthe receiving means are combined with each other, the receiving meansincludes a top chassis including a fixing piece to combine the topchassis with the printed circuit board, and the printed circuit boardincludes a ground pattern corresponding to the fixing piece.
 2. Theliquid crystal display device of claim 1, wherein said power supplyingmeans is disposed at a back of said receiving means.
 3. The liquidcrystal display device of claim 2, wherein said power supplying meansincludes a transformer for converting a power from outside into thedriving power which is to be provided to said display means.